Java starts from scratch 46 (Junit)

First, software testing

Software development:

Project research--requirement analysis--Software Design--Program code--Software testing--operation and maintenance

Software testing: The process of using test tools to perform functional and performance testing of the product in accordance with test scenarios and processes, or to run or test a system by manual or automated means. The aim is to check whether the required requirements are met and to identify the difference between the expected and actual results.

Cartridge test-white box test-regression test-unit test

Second, junit-Unit test Tool

Third, test JUnit test class

To create the class being tested

 PackageCom.pb.junit;/**create tested Class *2.junit 3.0 or 4.0 there are 3.0. Create a test class * simple implementation plus, minus, good, except the calculator*/ Public classCalculator {//result of Operation    Private Static intresult; //addition     Public voidAddintN) {Result+=N; }    //Subtraction         Public voidMinus (intN) {Result-=N; }        //Good Way         Public voidMultintN) {            //result*=n;        }        //Division         Public voidDivintN) {            if(n==0) {System.out.println ("The divisor cannot be 0!"); }Else{result/=N; }        }        //Radical : Dead Cycle         Public voidSqr () { for(;;) {                            }        }                //Square         Public voidSquareintN) {Result=n*N; }        //Clear 0 Operation results         Public voidClear () {result=0; }                         Public  intGetResult () {returnresult; }         Public  voidSetresult (intresult) {Calculator.result=result; }        }

Using the JUNIT3 test

 PackageCom.pb.junit;ImportJunit.framework.Assert;Importjunit.framework.TestCase; Public classCalculatortestextendsTestCase {//To create a test class objectCalculator calculator=NewCalculator (); //methods to run before the test starts    protected voidSetUp ()throwsException {Super. SetUp ();        Calculator.clear (); System.out.println ("Before testing"); }    //methods to run after the test is finished    protected voidTearDown ()throwsException {Super. TearDown (); System.out.println ("After testing"); }    //the test method in JUNIT3 must begin with testing     Public voidTestadd () {Calculator.add (2); Calculator.add (3);//2+3 result is 5                intresult=Calculator.getresult (); Assert.assertequals (5, result); }     Public voidTestminus () {Calculator.minus (1); Calculator.minus (5);//expected result is-6        intresult=Calculator.getresult (); Assert.assertequals (-6, result); }     Public voidTestmult () {Calculator.mult (3); Calculator.mult (4); intresult=Calculator.getresult (); Assert.assertequals (12, result); }     Public voidTestdiv () {Calculator.div (8); Calculator.div (0); intresult=Calculator.getresult (); Assert.assertequals (4, result); }    }

Using JUNIT4

 PackageCom.pb.junit;Import Staticorg.junit.assert.*;ImportOrg.junit.After;ImportOrg.junit.AfterClass;ImportOrg.junit.Before;ImportOrg.junit.BeforeClass;ImportOrg.junit.Ignore;Importorg.junit.Test; Public classcalculatortest {Calculator Calculator=NewCalculator (); @BeforeClass Public Static voidSetupbeforeclass ()throwsException {System.out.println ("============ before all tests are performed"); } @AfterClass Public Static voidTeardownafterclass ()throwsException {System.out.println ("Execute ========== once after all tests"); } @Before Public voidSetUp ()throwsException {System.out.println ("========== each test before executing");    Calculator.clear (); } @After Public voidTearDown ()throwsException {System.out.println ("Execute ============= once per test"); }    //@Test is required, the test method may not start with test, must be public, no return must be void@Test Public voidTestadd () {Calculator.add (3); Calculator.add (2); intresult =Calculator.getresult (); Assertequals (5, result); }    //Ignore this test method@Ignore @Test Public voidTestminus () {Fail ("Not yet implemented"); } @Test Public voidTestmult () {Fail ("Not yet implemented"); }    //throws a pre-defined exception@Test (expected=arithmeticexception.class)     Public voidTestdiv ()throwsarithmeticexception {calculator.add (8); Calculator.div (0); intresult=Calculator.getresult (); Assertequals (0, result); } @Test (Timeout=5000)//more than 5 seconds, the test failed     Public voidTestsqr () {CALCULATOR.SQR (); Fail ("Not yet implemented"); } @Test Public voidTestsquare () {Fail ("Not yet implemented"); }}

Test suite

 PackageCom.pb.junit;ImportOrg.junit.runner.RunWith;ImportOrg.junit.runners.Suite;Importorg.junit.runners.Suite.SuiteClasses; @RunWith (Suite.class) @SuiteClasses ({//name of the test case classCalculator1test.class, Calculator2test.class, Calculatortest.class    }) Public classtotaltest {}

Java starts from scratch 46 (Junit)